The APS booster lattice consists of 2 superperiods, 2 quadrants per
superperiod with 10 FODO cells per quadrant. The magnets are arranged
in five main families wired in series and powered by a single supply.
There are 68 dipoles (BM), 40 focussing (QF) and 40 defocussing
quadrupoles (QD) and 32 focussing (SF) and 32 defocussing (SD)
sextupoles. Orbit correction is performed using 40 horizontal and 40
vertical correctors and 80 horizontal and vertical BPMs. Injection is
on-axis using a single septum and kicker approximately 90 degrees in
betatron phase advance apart. Extraction uses a single kicker and
septum. The injection septum is located in the missing magnet region
of the second superiod and the extraction septum is located in the
straight section just after the first superperiod. Injection and
extraction are performed ``on the fly'' which means that the magnetic
fields increase linearly (no flat-tops or porches) during the single
turn injection and extraction process. Four LEP style normal
conducting cavities located in the straight sections are used to
supply rf power in the booster.

The lattice design is the so called ``missing magnet'' lattice where
one dipole at each end of the superperiod is omitted to match the
dispersion in the straight sections to zero. This is only true for
the original lattice design which has 132 nm emittance. Two other
lattices were developed with lower emittance. Presently, the APS
operates using the 92 nm emittance lattice for normal operations. The
92 nm lattice emittance is actually 65 nm due (measured to be 77 nm)
(OAG-TN-2006-025),
[2], due to the fact that the booster is run
``off-momentum''. Off-momentum operation is guaranteed by the
increased rf frequency due to the shorter ``decker distorted'' storage
ring. Running off-momentum has the effect of adding additional dipole
bending in the quadrupoles and thereby increasing the horizontal
damping partition number at the expense of the longitudinal damping
partition number.
(OAG-TN-2003-005),
[3].
The other two lattices have similarly reduced
emittance compared to their on-momentum emittance. The major
difference between the three lattices are the quadrupole strengths
which set the tune and sextupole strengths which correct the natural
chromaticities.

The links listed below give the full lattice definitions in MAD format
for each booster lattice. The first three figures below show one
superperiod of the booster for each lattice defined by its 7 GeV
emittance. The fourth figure shows the magnet family current each 2
Hz cycle. Finally the fifth figure shows the booster as-built layout.